Printer&#39;s quoin.



No. 877,039. PATENTEDI JAN. 21, 1908.

, F. WBLAGKHALL- PRINTERS QUOIN. APPLICATION FILED APB..3, 190il l y @We Hf-@raggi THE mumls PETERS co., vast-Imam". c.

UNITEDV STATES PATENT OFFICE.

FREDERICK W. BLAOKHALL, OF FORT ERIE, ONTARIO, CANADA, ASSIGNOR OF ONE-HALF TO GEORGE B. HINKLEY, OF BUFFALO, NEW YORK.

PRINTERS QUOIN.

Specicaton of Letters Patent.

Patented Jan. 21, 1908.

Application filed April 3 1907. Serial No. 366.228.

To all whom it may concern:

Be it known that I, FREDERICK W. 'BLACK- HALL, a subject of theKing of England, residing at Fort` Erie, in the Province of Ontario and Dominion of Canada, have invented a newv and useful Improvement in Printers Quoins, of which the following is a speciiication. y

This invention relates to the class of printers quoins comprising a pair of Wedgeshaped sections having opposing gear racks adapted to receive the pinion of the customary key by which they are tightened and loosened, and more particularly to quoins of this kind having automatic catches for preventing slipping or loosening of the wedges on each other by the jarring of the printing press.

The object of my invention is to provide the quoin-sections with a simple and effective automatic lock of this character which does'not materially increasethe cost of thel quoin.

4In the accompanying drawings: Figure 1 is a side elevation of the quoin. Fig. 2 is a central longitudinal section thereof. Fig. 3 is a face view of one of its sections. Fig. 4 is a perspective view of one of the sections.

Similar letters of vreference indicate corresponding parts throughout the several views.

l A, A indicate the two Wedge-shaped sections of the quoin each preferably provided on its face with the customary longitudinal central rib b which has an inclined-face and slides in a groove or recess c in the face of the inwardly-projecting lug O forming the large end of the section. On opposite sides of their central ribs b, the sections are provided with the usual gear racks d which are depressed below the faces of the ribs and adapted to be engaged by the gear pinion D of the customary operating key.

Secured to the back of each section is a iiat spring E extendinglengthwise thereof and having its free end portion bent inwardly and arranged adjacent to and substantially parallel with the large end of the section, to form a spring-tooth or catch e. 'This catch is adapted to interlock with one of a series of teeth b1 formed in the face of the rib of the other section, as shown in Fig. 2, to revent 4slipping of the sections on each ot er and As shown in Figs. 2 and 3, lthe body of each l bent end exten1 spring E is countersunk in a longitudinal groove g formed in the back of the section while its tooth e is countersunk in a transverse groove or recess g1 arranged in the large end of the section and forming a continuation of the groove g. The tooth e of each section projects normally beyond the toothed face of the rib of the same section, so as to in-` terlock with the toothed rib of the opposing section when the two sections are placed face to face, as shown in Fig. 2. The rear ends of the springs E may be secured to the sections by rivets or other suitable means. In the preferred construction shown, the grooves g gradually increase in depth toward the large ends of the sections and the springs follow the inclined bottoms of the grooves, which latter are deep enough to allow the springs to recede suiiiciently to clear the toothed ribs in shifting the quoin-sections on each other. The Walls of the grooves g, g1 hold the springs against lateral displacement and thus enable each spring to be fastened by a single rivet, as shown.

The teeth of the ribs b are preferably V- shaped or inclined on both sides, as shown, so that the sections can be released or backed up by simply shifting them lengthwise on 'slipping and loosening of the .same by the jarring of the printing press as above described.

The spring E and catch e of each quoinsection are formed of a single piece of springsteel or other suitable material, producing a very simple construction which is not liable to get out of order and which adds but littlel to the cost of the quoin. Both parts of the quoin including their locking catches are identical and they are therefore interchangeable like the corresponding sections of ordinary quoins of this class.

I claim as my invention:

1. A wedge shaped 'quoin section, provided onits face side with a toothed longitudinal rib, in its back with alongitudinal groove and in its large end with a groove forming a continuation of said longitudinal groove, and a fiat spring secured lengthwise in said longitudinal groove and having its free end portion bent inwardly and arranged in the end groove of the uoin section, said inwardly 'ng beyond the face of said toothed rib and forming a springtooth a spring-tooth adapted to interlock with the adapted to interlock With the corresponding teeth of the opposing section, substantially rib of an o posing quoin-section, substanas set forth. tially as set orth. Witness my hand h2. A quoin eornprlilsing a pair of Wedge@ 1907.

s aped sections eac provide on its 'ace l side with a longitudinal series of locking FREDERlCK-W BLACKHALL' teeth, and a spring secured to the back of the Witnesses: section and having its free end bent inwardly C. F. GEYER,

around the large end of the section, forming E. M. GRAHAM.

this 30th dayof March, 

